syzbot


upstream-arm64 test error: INFO: task hung in prepare_namespace

Status: upstream: reported on 2024/06/28 21:30
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+b2e8737f75941acc4220@syzkaller.appspotmail.com
First crash: 14d, last: 14d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kernel?] upstream-arm64 test error: INFO: task hung in prepare_namespace 0 (1) 2024/06/28 21:30

Sample crash report:
INFO: task swapper/0:1 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc5-syzkaller-g59ed70ca3c29 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:swapper/0       state:D stack:0     pid:1     tgid:1     ppid:0      flags:0x0000000c
Call trace:
 __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x14ac/0x24d8 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6837
 wait_for_device_probe+0x120/0x1c0 drivers/base/dd.c:772
 prepare_namespace+0x5c/0x11c init/do_mounts.c:479
 kernel_init_freeable+0x360/0x478 init/main.c:1591
 kernel_init+0x24/0x2a0 init/main.c:1467
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffff80008f3879e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:328
3 locks held by kworker/u8:5/202:
 #0: ffff0000c181d148 ((wq_completion)async){+.+.}-{0:0}, at: process_one_work+0x624/0x15b8 kernel/workqueue.c:3205
 #1: ffff800098077c20 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: process_one_work+0x6a0/0x15b8 kernel/workqueue.c:3205
 #2: ffff0000c27c81b0 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline]
 #2: ffff0000c27c81b0 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1093 [inline]
 #2: ffff0000c27c81b0 (&dev->mutex){....}-{3:3}, at: __driver_attach_async_helper+0xc8/0x230 drivers/base/dd.c:1143
2 locks held by kworker/u8:6/216:
 #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x624/0x15b8 kernel/workqueue.c:3205
 #1: ffff800098347c20 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work+0x6a0/0x15b8 kernel/workqueue.c:3205
1 lock held by hwrng/1372:
 #0: ffff800090aef948 (reading_mutex){+.+.}-{3:3}, at: hwrng_fillfn+0x6c/0x2b4 drivers/char/hw_random/core.c:495

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Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/28 21:31 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 59ed70ca3c29 757f06b1 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 upstream-arm64 test error: INFO: task hung in prepare_namespace
2024/06/28 19:25 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 59ed70ca3c29 b62c7d46 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 upstream-arm64 test error: INFO: task hung in prepare_namespace
* Struck through repros no longer work on HEAD.